Fire-box



(No Model.)

P. H. BAILEY.

PIRE BOX.

No. 486,018. Patented Nov. 8, 1892.

m a D Q NI l i T l/mSSe/S Vi lwevziolf K F. w78 fladey' 8 am vzwombys'UNTTED STATES PATENT @Trina FRANK H. BAILEY, OF lVILKES-BARR,PENNSYLVANIA.`

FIRE-BOX.

SPECIFICATION forming part of Letters Patent No. 486,018, dated November8, 1892.

Application tiled February 12, 1892. Serial No. 421,255. (No model.)

To all whom it may concern,.-

yBe it'known that I, FRANK H. BAILEY, a citizen of the United States,and a resident of Vilkes-Barr, Luzerne county, Pennsylvania, haveinvented certain Improvements in Fire- Boxes, of which the following isa specification.

My invention relates to fire-boxes for boilers or heating-furnaces ofany kind, its main object` being to automatically regulate the amount offuel exposed to combustion, as more `fully set forth hereinafter.

In the accompanying drawings, Figure 1 is a sectional view on the line 12, Fig. 2, of a fire-box constructed in accordance with my invention;and Fig. 2 is a face View of the same partially in section.

The boiler A, Fig. 1, is constructed in any suitable manner, the formillustrated being one in which a series of vertical tubes connect upperand lower communicating headers. The fire-box B is inclosed by verticalgrate-bars C, preferably covered with nonconducting material c,preferably asbestus, and being, if desired, hollow and communicating atthe upper and lower ends with headers D in communication with the mainbody of the boiler, so that there will be a circulation of water andsteam through the gratebars, although this is not essential to preventthe burning or destruction of the grate-bars, inasmuch as saidgrate-bars are covered by the non-conductin g material c, although ifthe non-conducting material be dispensed with the grate-bars may veryproperly form a part of the boiler.

The grate-bars are protected on either side and in front and rear bycovering-plates E E, the covering-plates E on the front and rearextending from the top down to about the low-water line in the boiler,(which is represented at cc x in Fig. 1,) and the amount of fuel in thefire-box exposed to the draft is governed-by vertically-adjustableplates F F, situated at the front and rear of the fire-box, asillustrated, or at the front or at the rear alone, as desired, thehigher the adjustment of the plates the greaterthe amount of fuelexposed to the draft.

The plates or doors F F are counterbalanced by a weight G, connected bychains g, passing over pulleys h, to the doors, and by moving theWeights by hand or mechanically, or by having handles on the doors, theymay be raised or lowered to expose a greater or less amount of fuel. Iprefer, however, to provide for this adjustment automatically byconnecting the chains to a lever t' under the control of a diaphragm ina pressure-chamber I, connected bya pipe 7c to the steam-space of theboiler, so that as the pressure of steam varies the doors F will beopened to a greater or less extent, as required.

The fuel is introduced into a hopper L and the combustion-chamber ispreferably kept filled with fuel, the clinkers being ground up and theresidue discharged at the bottom of the fire-box by means of one or moresuitablyshaped grate-bars m. Under a forced draft the frontof thetire-box is inclosed by a casing N, and the amount of air admitted isgoverned automatically by a valve attached by a chain a to one end ofthe lever t', or, as shown in Fig. 2, a natural draft may also beregulated by connecting the valveV of the casing N to such lever t'. Itwill thus be seen that as the steam-pressure falls the doors F will beraised and a greater or less amount of fuel exposed to the draft andconsumed. The fuel above the edge of the door, being inclosed and notmingling with the oxygen, is gradually fed down as the residue isdischarged by the rotating grate-bars m.

Having thus described my invention, I claim and desire to secure byLetters Patent- 1. A fire-box for boilers, comprising a series ofVertical grate-bars partially inclosed and adjustable gates or doors forexposinga greater or less amount of fuel in the lire-box.

2. The combination, in a lire-box, of a series of vertical grate-bars, acasing partially inclosed in the same, and vertically-adjustable doorsfor exposing a greater or less amount of fuel, substantially as specied.

3. The combination,in the fire-box, of a series of vertical grate-bars,a casing partially inclosed in the same, vertically-adjustable doors forexposing a greater or less amount of fuel, and a pressure-chamberconnected to IOO the steam-space ofthe boiler and having a dia.- Intestmon y whereof I have signed my lo phragrn operatively connected tosaid doors, I name to this specification in the presence ofsubstantially as specified. two subscribing Witnesses.

4L. The combination, in the lire-box, of the vertical grate-bars, anon-conducting covering FRANK H. BAILEY. for said grate-bars, adjustabledoors for regulating the amount of fuel exposed, and a grate Witnesseszbar or bars at the bottom of the reboX,sub GEORGE T. KIRKENDALL,stantially as specified. THOS. H. ATHERTON.

